So you parked on a red route which, unless otherwise excepted, is a contravention.
You parked in a white-lined area preceded by DRL.
You were obliged to look for a sign which exempted you from whatever Red Route restriction applied. But you didn't. Had you looked then you would have seen the back of a sign and then, seconds later, read the prohibition and exemptions.
IMO, saying the sign has twisted will not avail you.
In addition, did you leave the location without establishing what's what?
Issues include:
This is a GLA side road, does the order provide the prohibition?