very strange.
It should be noted that Arbiters have flexibility in making decisions in certain situations -- that not everything is black and white.
my opinion -- at the 2nd occurence of this, arbiter should have ruled the Clock faulty and replaced it........unless that clock was owned by you and you knew how it worked.
"and my opponent wanted one move of his taken back, because he claimed he made that move just because of the less time on my clock. The arbiter allowed this, " Wow !!!!!! that should never be. Once you make a move, that's it -- unless it was illegal. There are all sorts of reasons why someone plays a move. Your opponent can say anything about his motivations to select a move. Why should that matter ?
A few days ago I played a rapid chess tournament (clock time: 25min +10 second incriment). The arbiter programmed the clock to have that time setting. I was playing against a higher rated opponent, and achieved a winning position. When I had around 1 minute on the clock, I realized that my time wasn't increasing after making a move. I paused the clock and informed the arbiter. He reprogrammed the clock to have an incriment, and my opponent wanted one move of his taken back, because he claimed he made that move just because of the less time on my clock. The arbiter allowed this, and I was okay with this because I was winning anyway. The clock started and we started to play. I didn't notice the time on my clock, but when I had around 10 seconds left, I realized that the time wasn't increasing on my clock again. I informed the arbiter, however this time he said that it was my fault that I didn't notice before and told me to play on. I lost that game...was the arbiters desicion correct?