I've tried plenty of animations as well as using different frames and the bug persists. I changed to another bow, used the skin and there's no issue. So I can say it's not the skin, but Daikyu itself being buggy.
The Oscira Bow skin shows some glitch for the string when used on Daikyu. There are no problems when equipping on other bows. I also realized this bug has been ongoing since at least 2016, with the Dryad skin also showing similar problem. https://forums.warframe.com/topic/691483-dryad-bow-skin-string-bugged-on-daikyu/ https://imgur.com/a/Rtp76vm ps: How to post screenshot url again? Got confused a bit.