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Here's some M1917 parts that have some obvious differences that could have caused interchangeability issues.
The M1917 extractor on the left is a CV extractor. It is without a gas hole, is in unused condition and works very smoothly to extract a spent case in all modes.
The one in the center is a Winchester extractor with a gas hole drilled near the claw. The claw is slightly worn on the left side. It still works well to extract the spent case from the receiver if the cartridge is loaded from the magazine but the bolt requires a greater amount of force to close on a cartridge that's loaded directly into the receiver. The difference in the radius that's cut into the leading edge is probably the cause.
The extractor on the right fits a M1917 bolt but the claw is different and it won't close on a 30-06 cartridge. Does anyone recognize it? Maybe a P14?