I created a button which sends redstone signal to a repeater loop to always stay on like an RS NOR Latch (but without a reset) and from there I power 2 other repeaters facing to a block with redstone torches above to open closed iron doors. When I remove the connecting redstone from the "always-on repeaters" to the repeaters powering the torches the stay active. But they should be disabled?
The repeater in the bottom left of the picture is pushing direct power into the block in front of it (the one the torch is sitting on). This power bleeds out the side of the block into the wire (because it is direct). Minecraft is working as intended, the bug is in your wiring.