I've had this happen as well
I took Larry Vickers' 1911 Operator Course a few years back. I'd been going back and forth between a grip-reduced Glock 21 and a twin pair of Colt Series 70s for EDC (long story, but appears later) in the months before attending the course.
Had the dreaded draw stroke, extend lockout, no bang three or four times. Couldn't find a pattern assumed it was operator headspace (OHS) and kept practicing my IAD for a malfunction (which got darned fast). When LAW wrapped up the course I asked him as an aside to check the gun over (we'd detailed stripped the guns early on day two and they'd all been gone over for eyeball compliance to spec' and function checks). He racked the "old school" gun three or four times and couldn't make it do it.
My first take away was OHS. I did change out the potentially offending spring when I got home and could get one from Brownells. It still happens on occasion so I default to OSH as I shoot the big Glocks most of the time now.
I concluded the minute adaptations we make to griping one gun or another was the culprit. I proved unable to kinesthetically sense the difference in my operation of one gun over the other while trying to get and maintain a good, hard firing grip. If I were going back to a 1911, I might consider going back to a Modified Weaver/Chapman stance (I know, the 80s called and want their grip/stance back) to support a more traditional handling of the 1911. I shoot the Glocks (and most non S/A guns) in more of a modern Iso' stance. I think all of these factors and adaptations interact.