Cocking issue R5M

Had an odd issue start popping up for me lately. After taking a little break from shooting I noticed that my .25 R5M is having issues with cocking. Specifically, when I cock the handle back it cycles just fine, but the action doesn't remain to the rear. Instead, it tries to spring back forward without being pushed. I take that to mean it didn't cock. Does this mean I have an issue with sear engagement? Anyone else exp this?

Pulling the cocking handle back and trying to get it engaged multiple times, I ended up putting 3-4 pellets into the barrel once. Not ideal.
 
Did you look through the sear window for proper engagement?

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