BUGS for Tahm

I observed two bugs for Tahm. First one is one of my friends can not use his ult. Whenever I jump in, or he try to move to the target location. It will be fail. The most ridiculous part is if I jump into his ult. He will caryy me as use Devour, and if he spit me out to a wall, I will lose heal. The last time I lost almost 2000 heal. Another bug is today, when a jg Tahm Devour a minion, and this minion will not go with him. It is looks like the minion has 1 heal fix and move forward. The worest part is the minion grab the tower's attention, and the tower is unable to kill it. So the enermy team dave us for sure. That is all. Hope you can fix this soon. It is not happen in every game, but it is apparently something wrong with the ablity "Devour".