Credit Addition Glitch

There seems to be a glitch it the additional credit section. This has happened a few times lately but I was adding the missing credited cast to The Secret of Lost Valley (1980) and a few uncredited people and I got the "are you sure this is the right person, his last credit in this category was 10+ years ago" The trouble is it wasn't his last credit. It seems there is a bug in the IMDb code that now instead of going off of their overall filmography it is going off of their last credited role. George Hickman had tons of uncredited bit and extra roles post 1964 but for some reason now the IMDb computer is reading their last role with screen credit as their last role. Same thing happened today when I added George Holmes to an early 1980s series today. It's obviously an easy workaround, just check the box but I figure IMDb staff should know of the issue so that the warnings shouldn't come up.  Phil