Strider flying

I tried to move my strider to my nether portal but since it can't go up blocks normally, I had to use a lead, unfortunately the strider started flying every time it went up a block and kinda levitated there for the rest of time, and the worst part is I couldn't bring it back down, but thankfully I had a night up nether portal so I built a lava pool next to it for now, but please fix this issue because I want to use my strider but I can't bring it down to lava level