If you post a code snippet, ALWAYS USE CODE TAGS:
How to use code tags: Using code tags properly
If you have a visual glitch, take a photo or snap of it, or else post a video on Youtube.
If you’re reporting mitering or cornering issues, LineRenderer / TrailRenderer definitely has artifacts at corners and these can be worked around in various ways, such as by duplicating corner points if their in / out vectors exceed a certain acuteness angle.