I have had WWB .45 ACP that was out of OAL (too long) enough to cause nosedives in my FNP-45 magazines, leading to FTFs. However, those magazines are exceptionally sensitive to loaded cartridge length, which is why FN lengthened the mag tubes and slide travel for the FNX-45.
I don't think 1911's are particularly sensitive to OAL, but I suppose that your slide stop lug could be making contact with long loaded cartridges as they feed from the magazine, causing them to nosedive but not raise the slide stop at a point that would lock the slide open.
Or are they feeding too high and going into the barrel hood instead of the barrel?
I typically avoid WWB because it's low quality IMHO, and Winchester seems to be on a high horse about their prices lately.