Inconsistent 'creeping' speed?

I just bought the vehicle listed above TDI (191,000 on it) and it's my first diesel vehicle. Generally, it drives great: excellent acceleration and shifts well.

However, when I take my foot off the brake it reacts inconsistently. Sometimes it 'creeps' forward at steady pace immediately but other times there's a one-second delay before it starts 'creeping'.

I'm wondering if it's the 'hill hold' acting up on me?


Any thoughts on this are appreciated. Thanks in advance.