medaniwd

I have a SVG with a rectangle that is build out of 3 lines. The left and right lines draw themself like they should, but the bottom one gets bolder as long as the animation is playing. 1. & 2. Animation builds up - already bolder than it should be 3. There's also a slightly thicker part at the right site for a moment 4. Animation is ready and jumps to the "original" appearance - That's how the stroke-width should look like all the time I'm new to it so I am trying to figure out if it's a known problem or if there's a mistake with my SVG - or something completely different Thank you in advance