New Grower FF Tiger bloom lowering ph

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Tiger bloom is throwing my ph off to ~4. Starting at 6.5 ph in a 2.6 liter bottle. Added half tsp of calmag, ph tested 6.5 again. Added half tsp grow big, ph was still 6.5. Then finally 3/4 tsp of tiger bloom threw the ph down below 4
Last feed it had no problems and came out at 6.5-7.0. weird?!
Anyone have experience with this issue and knows the cause?

also I'm using ph drops to test ph.(getting a more reliable source asap)
 
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