This bug has been in the game far too long. I’ve lost millions upgrading pet skills. I have two purple pets that require skill points but I’m afraid to add them in case the game decides to upgrade all the way to 40 (I have 80 available at start.)
It really makes it a pain to upgrade. I don't want to spend all my points or coins in one place. But every time I dare try its just a few clicks before I have them all used up. NOT GOOD AT ALL and not a joke.
It is both. Today I was using the ability screen and tapped one ability. Another ability I had not touched yet ran up 20 or so points. I immediately logged out and logged back in. The points and coins are still gone. Yesterday one of my taps ran up a ton of points and logging out worked. I got everything back. I do not tap quickly. I wait about a second between each click and go slowly just to try to avoid this problem. So far the only thing that avoids this is playing on my Computer using an emulator and a mouse. Even that way I often get double points on a single click. They really need to fix this.
Update. I emailed customer service to prove to them it's a bug. I got email back saying they did not get the video. Posted a private video on YouTube sent customer service a link. So far no email, no reply in customer service chat and still the bug runs up all my ability points on one random click or even just by hitting the arrow to the next character without even tapping an ability.