Default date

I use a linked form to record session details with clients. I record a date for each session. I have this set to default to todays date. This worked ok but has recently stopped working. When I create a new record the date that appears is not the current date but it appears as the date of a previous record. It only appears wrong when I am in the linked record field. When I go back to main record it is the current date. If I click on the record to look at the record it changes to previous date. This is very confusing.

Any ideas? I am using El Capitan but this error has been happening for a long time, well before the upgrade.