Sorted Map Stops Working After X Size [partially resolved]

For this project, I'm attempting to create a sorted map of maps where the keys are numbers.

{:deps {org.clojure/clojure {:mvn/version "1.10.1"}
        ;; complient is used for autocompletion
        ;; add your libs here (and restart the runtime to pick up changes)
        compliment/compliment {:mvn/version "0.3.9"}}}
deps.edn
Extensible Data Notation
{:hello (clojure-version)}
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This first example works as expected - I put 8 items inside, then sort

;; start of example 1
(def maps1 (atom {}))
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(swap! maps1 assoc 100 {:banana :tree}
              400 {:frog :tree}
              300 {:banana :frog}
  200 {:banana :bunny}
 105 {:bunny :tree}
              410 {:banana :butterfly}
              360 {:butterfly :tree}
              225 {:banana :banana} 
  )
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(into (sorted-map) @maps1)
;; end of example 1
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This 2nd example doesn't work as desired - I put 12 items inside, and then it seems I cannot sort as before

;; start of example 2
(def maps2 (atom {}))
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(swap! maps2 assoc 100 {:banana :tree}
              400 {:frog :tree}
              300 {:banana :frog}
  200 {:banana :bunny})
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(swap! maps2 assoc 105 {:bunny :tree}
              410 {:banana :butterfly}
              360 {:butterfly :tree}
              225 {:banana :banana} )
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(swap! maps2 assoc 505 {:bunny :tree}
              110 {:banana :butterfly}
              660 {:butterfly :tree}
              525 {:banana :banana} )
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(into (sorted-map) @maps2)
;; end of example 2
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Please let me know if you have any advice or know-how on how to resolve this, thank you!

Link back to Clojureverse request for help: https://clojureverse.org/t/has-demo-cant-seem-to-make-a-sorted-map-of-12-items-can-you-help/7632

...

I'm going to try next to create an initial map of size 12 with one swap! + assoc, and see if this changes anything... 

;; start of example 3
(def maps3 (atom {}))
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(swap! maps3 assoc
  100 {:banana :tree}
  400 {:frog :tree}
  300 {:banana :frog}
  200 {:banana :bunny}
  105 {:bunny :tree}
  410 {:banana :butterfly}
  360 {:butterfly :tree}
  225 {:banana :banana}
  505 {:bunny :tree}
  110 {:banana :butterfly}
  660 {:butterfly :tree}
  525 {:banana :banana})
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→
(into (sorted-map) @maps3)
;; end of example 3
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... This also appears to be not sorted.

Recap: Issue resolved... for now

I can't say exactly what is causing this behavior, but thanks to Andy, I now have a work-around to access the correctly sorted map in string form.

Clojureverse Help Thread: https://clojureverse.org/t/has-demo-cant-seem-to-make-a-sorted-map-of-12-items-can-you-help/7632/2?u=avidrucker

@maps1
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@maps2
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@maps3
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;; converting to a string representation shows that the map is indeed sorted correctly here
(pr-str (into (sorted-map) @maps2))
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;; converting to a string representation shows that the map is indeed sorted correctly here as well
(pr-str (into (sorted-map) @maps3))
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;; ... however, reading from a string back into (map? sorted-map? something else?) seems to revert back to the prior (default?) sorting order that is not numerically sorted
(read-string (pr-str (into (sorted-map) @maps3)))
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Runtimes (1)