Command history doubles each shell start

Hello. Long time user, 1st time posting...

I don't know if this is a bug or a configuration issue. I have had problems with the command history for a while now.

If I start a tcc shell:
[c:\]history | wc
246 614 4513

If I start another shell:
[c:\]history | wc
492 1228 9026

(All history commands are doubled)

And if I start another:
[c:\]history | wc
990 2462 18088

[c:\]history /N

[c:\]history | wc
246 614 4513

This is...

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