Please help us help you and fill where relevant:
Your LimeSurvey version: Version 5.3.16
Own server or LimeSurvey hosting: LimeSurvey Cloud
Survey theme/template: Fruity
==================
Hi everybody,
I have an issue with a question Array (Numbers). The question accepts every type of number even negative ones, but when I try to write something like "-0.22" Limesurvey deletes the minus in front of the number before I can finish writing it. If I add the minus after writing the number then limesurvey keeps it, so It's not a problem of response format.
That problem doesn't exist with negative numbers that don't start with a zero, like "-1.34".

Regards
Carlotta

Since you are paying for the cloud version, you can contact LimeSurvey support directly - account.limesurvey.org/support/support

If i don't make error it's an issue fixed in last version.

It doesn't seem to be fixed in 5.6.10.