Yeah just one of many variables that make it hard to accurately compare fielders' stats.
Like say you're an OF that plays behind an extreme strikeout and gb staff so you get limited opportunities, you may end up saving less runs than the player that gets more chances but that doesnt mean you're a worse fielder.
The fact that different metrics can spit out drastically different views on guys is all you need to know about the accuracy of fielding stats. Now if all the stats say a guy is great then he probably is, same thing with bad but when you get a mixed bag or its kinda neutral I don't put a ton of stock in them.