Elytra “Crawl” instead of landing

I tried to use elytra, but they just for whatever reason don’t deactivate when I hit ground — which means no elytra jumping. Then when I fall off a block it kind of glides down — like elytra. When I fall off a few blocks, I just glide like normal, but when I tried to elytra-jump, it gets stuck in this sort of “crawling” position. I don’t know if this is just a bug that effects me, or something serious, but I don’t like it — especially since it’s just absolutely annoying to get around. I don’t know what versions it affects either, I just know it affects 1.16.5.