[Solved] Very wide kerning when typing + in different font. May have enabled accidentally?

[snow]

I was pressing various hotkeys because I forgot which one I had bound to flatten folder. I noticed the next day while trying to rename a file that the kerning was extremely wide. If I pasted text from elsewhere it appeared normally, but anything typed had this wide appearance:

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portal_document abc a b c ABC123

upon copying the file name...

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portal_document　ａｂｃ　ａ　ｂ　ｃ　ＡＢＣ１２３

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text text

upon copying what was in the box...

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text　ｔｅｘｔ

I'm not sure if it's a bug per se. If it isn't, what on earth did I enable? XYplorer is nearly unusable with this enabled.

[snow]

SOLUTION

Spent a good ten minutes just pressing random hotkeys. Maybe I've activated something else, but that doesn't matter. What matters is that ALT,+ enables and disables this.
What a strange feature

[admin]

XYplorer doesn't do this. Must be another app running on your system.