I'm a bit lost on this one and I could really use the benefit of more experienced players' knowledge, please. I've just re-strung my American Standard Precision with La Bella 760 FM flats. It had the FS ones on before. Really bizarre thing: all tuned and intonated, etc. but I have two notes on my 'G' string that sound very strange. The 'D' shows briefly as significantly sharp on my tuner , then decays almost immediately, with nothing by way of sustain. The 'C sharp' exhibits a similar pattern, although not as pronounced. 'C' and 'D sharp' are perfect (as are all other notes on that string and on all other strings). I can't say for sure whether it was like this with the previous set of strings. Does anyone have any ideas, please? Is this a not too uncommon trait with basses like mine, or is it a string issue? Many thanks.