Yiddish glitches on mac

I used Yiddish Keyman on my PC without problems. Just switched to a MacBook Pro (running Big Sur, 11.6.8) and I am getting weird random glitches. For example, if I try to type רײ, I might instead get רערײ. This can happen while I am typing in a google document, or when I am trying to type a word in verterbukh.org, but it is not at all consistent. I can try typing the same word several times and each time get a different extra letter (or two) inserted at the front of the word–or it may work just fine. Any advice would be welcome.

Is this happening in Chrome? If so, it might be related to the following issue which we are currently investigating: bug(mac): backspace not working as expected in Google Chrome · Issue #7526 · keymanapp/keyman · GitHub

hmmm… Yes, it is happening in Chrome (I haven’t had occasion to use the Keyman keyboard in other apps). I hadn’t noticed any connection to using the backspace key, but I suppose it is possible…

Backspace is used internally to transform text as you type so the issues may be visible even if you are not pressing backspace yourself.