Dual extruder calibration and stringing

For the past two weeks, ive been trying to improve my 3dp calibration results (without much success).

However about 2 or 3 days ago the right extruder (white) started stringing when printing the XY calibration models

any ideas, how to get rid of it and what cause the problem?

I’ve run out of ideas …

and soon will run out of filament !

ps Is the physical position of the X and Y models normal as the guide suggests otherwise?

pps the comparison below show the ouput of the earlier pre-stringing models (outer pair) with the present stringing models ( inner pair)

ppps maybe burgerboy is on the right track