Xteink X4 waking up the Kindle

I noticed that when I place my Xteink X4 over my Kindle (10th generation Paperwhite), the Kindle wakes up for some reason. I am certain I am not pressing any buttons. It’s not a major issue, since it happens specifically when they are touching—simply resting one on top of the other doesn't seem to trigger it. However, I was curious to know if any of you have experienced this and what the possible causes might be. I’ve had the Xteink for a week, while the Kindle is about 7 years old.