Numerous times I have seen the ASK price not increase when an OTC stock reaches that price which kills the upward momentum. Why wouldn't the ASK automatically increase?
The ASK price represents someone willing to sell at a specific price. Although 'momentum' may be a statistical calculation of what could happen, it is ultimately down to whether the seller wants to increase the price he is willing to sell at or not.
OTC stocks tend to be less liquid than regular stocks, and as a result, statistical analysis (such as 'momentum') can begin to falter. You usually need about 30-40 data point to calculate an average. Further derivatives require even more datapoint.