So last night my band had an outdoor show. It was very hot and humid. I was playing my Amer standard P bass with TI JF an old set at least 5-6 years old. I use the same bass and tuner a clip on type to tune. I was checking the tuning all night. During the night I heard a few weird overtones coming from the band during songs. They were really nothing and the crowd never knew but they bothered me. Late in the set the band leaser told me to check my tuning it was off. ..by my tuner it was not. He checked his allot no problems with his. I i have never had this issue with my band and we use the same gear every show. The last song of the night was the Elvis version of Proud Mary where we really hit it hard and keep it moving. I was diggin in hard in the first posistion and the bandleader thought I was playing the wrong cord but was not. Hhe heard me flat F instead of F# I showed him and he shrugged it off. He told me I sounded flat allot tonight. The drummer said only when I played G or F#(1st posistion) it sounded funny like a weird harmonic tone...something weird. Could it be the strings? I have had a love hate relationship wit TIs but on this P bass they sound great. I checked intonation at the gig after our show and it was right on. Maybe the heat was a factor or while digging in I was bending the strings? I'm baffled by this and will check all my equipment. There are allot of TI lovers and haters so maybe somebody has an idea..maybe not. Thanks.