If you equip the Arrow Quiver, then draw an arrow back in the bow and use the active ability while the bow is drawn, you will cause the passive ability (Flexible Bowstring) to turn off.

Here is a video demonstrating the bug: https://www.youtube.com/watch?v=5XNDIJLlcts

Upon further investigation, this may be intended behavior. I'm not sure, so if it is just close this issue.

Hey. Thanks for the info. This issue caused by rude check of cooldown while searching for equipped relic: https://github.com/SSKirillSS/relics/blob/master/src/main/java/it/hurts/sskirillss/relics/utils/EntityUtils.java#L169

Will be fixed in the nearest future.

Should be fixed now. Can be downloaded here: click.