To have bent a valve, it seems you would have to have put the idler in incorrectly, considering things were fine before your work. Haven't experienced this myself, and could be off base, but perhaps a seriously bent valve displaces the guide then gets free of the guide, giving the appearance of normal valve movement. (All guesswork and thought problems, right now.)
Less dramatically, did you recently replace your banjo bolts with ones having holes that are too large?
It could be a completely coincidental occurrence of simultaneous problems. A compression test is the very next thing you should do. If bad, shoot some oil in the cylinders. If no help, then the problem is probably not related to rings. [Sorry, if this is (as they say on the Jolly Ol' side of the pond), "teaching grandma how to suck eggs".]
Richard L.