STRANGE CASE WITH ATEM MINI

Hello! I have the following problem: I work with two ATEM Mini (HDMI) purchased on the same day from the same provider, both worked correctly; Three days ago one of them presented problems in the program output, I was connecting it to two monitors using an HDMI video splitter, and the image was not visible, I removed the splitter and connected the ATEM Mini directly and if the signal is seen on either of the two monitors. Logically I thought that the video splitter was damaged, but the strange thing is that I connect the other ATEM Mini that I have through the same video splitter and it can send a signal to both monitors. Both ATEM Mini are configured the same. Can someone tell me what could be happening? Thank you all.