Each time when i want to enter the board the Chrome Browser say's

Connetion not private

Hakers can try to steel your data from board.bitmeup.com (np. paswords, messages or bank card numbers).
NET::ERR_CERT_AUTHORITY_INVALID.

The only possibility to enter board is from advanced option bello the sign and enter with the sign - not secured
When i check this on matrox browser every thing is fine, only on chrome from few days on my Windows 8.1 system