Remember that the Czech way of telling time relates to the hour that is coming up. So this sentence actually says "It is half (to) one in the afternoon", which is for English speakers half past (after) twelve. It is just a different reference point. Note in other sentences that what seems to be "quarter to one" is actually "quarter TOWARD one", that is, a quarter after twelve.
Oke, thank you for confirming. I hear things like this quite a lot in this course. Sometimes it even sounds like words are playing at the same time. I was starting to think it was my laptop, but I never heard things like this with other courses. Should I report anomalies like this?