IO Effecting Multiple Pins

When I pull certain gpio pins down, other pins are briefly pulled down for just a moment. I’m thinking this is a configuration issue, but I can’t figure out why (I’m fairly certain I’ve locked things down correctly in the cape manager).

I’m using P9_11, P9_12, P9_13, P9_15, P9_23, P9_24, P9_26, and P9_27 all set to output with pull up. I’ve used the prebuilt cape configurations found here: and enabled the pull up state.

I also have SPI 0, HDMI, and eMMC installed in the cape manager.

Any thoughts on what could cause these other pins to briefly drop?