I have the same in my logs for ckpool.log. I think as long as the miner posts a diff, it is fine.
₿ I (81248394) nerdqaxe+: tmp1075 vs tps: 64.19 vs 70.38 (diff: 6.19)
₿ I (81248604) asic_result: Job ID: 20 AsicNr: 0 Ver: 25F5A000 Nonce 843C055C diff 2902.3/3156/66.7M
₿ I (81249894) asic_result: Job ID: 68 AsicNr: 1 Ver: 2361E000 Nonce A188090C diff 5170.9/3156/66.7M
₿ I (81250424) nerdqaxe+: tmp1075 vs tps: 64.12 vs 70.88 (diff: 6.75)
₿ I (81252454) nerdqaxe+: tmp1075 vs tps: 64.19 vs 70.62 (diff: 6.44)
₿ I (81253694) asic_result: Job ID: 28 AsicNr: 1 Ver: 20F16000 Nonce 3247084C diff 4777.4/3156/66.7M
₿ I (81254484) nerdqaxe+: tmp1075 vs tps: 64.19 vs 70.62 (diff: 6.44)
₿ I (81255544) asic_result: Job ID: 70 AsicNr: 3 Ver: 253B6000 Nonce FB4C1880 diff 27468.0/3156/66.7M
₿ I (81256024) asic_result: Job ID: 08 AsicNr: 3 Ver: 25018000 Nonce 80711D08 diff 6064.8/3156/66.7M
₿ I (81256514) nerdqaxe+: tmp1075 vs tps: 64.12 vs 70.62 (diff: 6.50)
₿ I (81257104) asic_result: Job ID: 38 AsicNr: 1 Ver: 26062000 Nonce 3EE10C5E diff 5652.3/3156/66.7M
₿ I (81258544) nerdqaxe+: tmp1075 vs tps: 64.19 vs 70.38 (diff: 6.19)
₿ I (81260274) asic_result: Job ID: 60 AsicNr: 1 Ver: 21FE2000 Nonce 3C900C34 diff 2313.8/3156/66.7M
₿ I (81260574) nerdqaxe+: tmp1075 vs tps: 64.12 vs 70.38 (diff: 6.25)
₿ I (81261304) asic_result: Job ID: 10 AsicNr: 3 Ver: 2260A000 Nonce A4A51BBA diff 3036.8/3156/66.7M
₿ I (81261814) asic_result: Job ID: 28 AsicNr: 2 Ver: 2273A000 Nonce 90481558 diff 11839.5/3156/66.7M
₿ I (81262114) asic_result: Job ID: 28 AsicNr: 2 Ver: 26190000 Nonce A70A150E diff 2463.6/3156/66.7M
₿ I (81262324) InfluxDB: POST: nerdq01 temperature=57.187500,temperature2=64.125000,hashing_speed=5021.010254,invalid_shares=0,valid_shares=0,uptime=81242,best_difficulty=66668392.000000,total_best_difficulty=66668392.000000,pool_errors=0,accepted=29300,not_accepted=43,total_uptime=81242,blocks_found=0,pwr_vin=11.921875,pwr_iin=6.679688,pwr_pin=79.500000,pwr_vout=1.148438,pwr_iout=59.062500,pwr_pout=67.875000,total_blocks_found=0,duplicate_hashes=0