If the “concatenate” function refers to or contains a “round” function, then a rounding error occurs.
Example =CONCATENATE(ROUND(0.65,1)) will contain 0.7000000000000001 instead of 0.7
Hello again @faraddin
We have registered this issue as bug 61293 in our internal bug-tracker.
Thank you very much for reporting it and sorry for the inconvenience caused.