Can someoneplease explain why this keeps happening to me and how to fix it ....

When I mine after while some of my miners report they are going speeds in GH/s which is obviously impossible ... I don't know if this as affecting my mining bit I would like it to stop ... also this was the first time I got HW errors ....

See image to see what i mean.. the top 2 are reporting speeds in GH/s.

http://imgur.com/5eUjbX6

GPU 0:  Gigabyte r9 290 OC (windforce)
GPU 1: Sapphire Tri-x r9 290
GPU 2: Sapphire Tri-x r9 290
GPU 3:  Sapphire Tri-x r9 290


HEre is my PC info:

http://imgur.com/8B3AQ9n

This is my config file content:


{
"pools" : [
   {
      "name" : "qhor P2P",
      "url" : "http://q30.qhor.net:8336",
      "user" : "CZVP8n6MhNigMn7adbF8e8zqCC3fgQFEZR",
      "pass" : "xx",
      "pool-priority" : "0"
   },
   {
      "name" : "CaCHE p2cache.syware.de P2P",
      "url" : "http://p2cache.syware.de:8336",
      "user" : "CZVP8n6MhNigMn7adbF8e8zqCC3fgQFEZR",
      "pass" : "xx",
      "pool-priority" : "1"
   },
   {
      "name" : "p2p-miner.info(0)",
      "url" : "http://p2pool-miner.info:8336",
      "user" : "CZVP8n6MhNigMn7adbF8e8zqCC3fgQFEZR",
      "pass" : "xx",
      "pool-priority" : "2"
   }
],
"api-allow" : "W:127.0.0.1",
"api-listen" : true,
"failover-only" : true,
"fix-protocol" : true,
"kernel-path" : "/usr/local/bin",
"no-submit-stale" : true,
"queue" : "0",
"gpu-threads" : "1",
"gpu-engine" : "1040,1000,1000,1000",
"gpu-fan" : "70",
"gpu-platform" : "0",
"gpu-memclock" : "1500",
"gpu-powertune" : "20",
"intensity" : "20",
"temp-target" : "85",
"temp-overheat" : "92",
"temp-cutoff" : "94",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"shaders" : "0",
"thread-concurrency" : "30592",
"scrypt-jane" : true,
"sj-Nfmin" : "4",
"sj-Nfmax" : "30",
"sj-time" : "1388949883"
}


Thanks in advance for help!