with this setup when you power the redstone or repeater next to the targetblock with the target block (this does not occur when you use a normal block and power that block). The piston moves the target block up because it gets powered with the redstone (that is powered through the targetblock) with a repeater I power the targetblock when it has moved up but if I connect any form of redstone, the redstone will be budded instead of powered. only if the targetblock gets moved up after 8gt it will behave normally.

-this happens to every redstone component not only redstone dust