Hi -
On the roll that you stand developed, what temp was the developer at when you started? Either way, Rollei doesnt reccomend stand development times at all. I believe you overdeveloped it. They do provide a development at 25 degrees C for 13 minutes with 1 agitation every 30 seconds. They also provide a develop at 20 degrees C for 21 minutes with 1 agitation every 30 seconds

Here is their guide that I use from Freestyle: