Hi there @Jeglova.
I had the same problem as you can see here.
Ara Trails and Better Trails are two of the most used trail assets in Unity, but they are still not perfect.
The animation is so fast that the trail tries to follow the sword frame by frame, but it can’t keep up to speed. To see this in action, reduce the Time.timeScale to 0.1f for example.
You could try to calculate the animation substeps and interpolate the trail with that data, but it may not be the best workaround.
It would be better to create a custom trail mesh for each animation. It is much cheaper in terms of performance, and gives you more control overall.
Hope I shed some light into the problem!