Numeric 'helper' input keyboard

I have created two numeric helper entities in HA as a test I am attempting. The numeric range was set as -1 to 1 in both cases. Due to a typo in the entity name I was having unsuccessful tests. Many attempts to edit the entity name were unsuccessful, although at some point an edit worked but was incorrect. In any case I eventually deleted the entity and recreated it. On the original creation the 10-key keyboard presented had the ‘.’ character and the ‘-’ sharing a single key. Now the ‘-’ character is missing from the 10-key. I am no longer able to set the value to -1.