I have heard of this issue with the G44 mags unfortunately, but it seems to be hit and miss, maybe certain runs of them have had issues. A friend of mine has 6 factory mags and has never had an issue with any of them( we have discussed this) but an acquaintance of mine bought a couple of extra factory mags and has the same issue you have? I have run Advantage Arms mags in my friends g44 and they seemed to work reliably, might be an option for you?Warning: gripe-rant follows. Paid top dollar for a bunch of extra factory magazines for my G44 and darned if they work very well at all. I really have to baby them when loading and then be very careful not to disturb how the rounds are protruding from the lips of each magazine to get them to operate in the gun at all. I waited ridiculous years for a .22 calibre Glock but should have waited forever, ie, not bought one at all. Gripe-rant ends.
If I remember correctly this was discussed in a thread on the G44 when they first came out