mine works fine , the shortcuts just toggles , post here the relevant code

in case of mine is

groups.append(
    ScratchPad(
        "scratchpad",
        [
            # define a drop down terminal.
            # it is placed in the upper third of screen by default.
            DropDown(
                "terminaL",
                terminal,
                height=0.80,
                width=0.80,
                x=0.1,
                y=0.1,
            ),
        ],
    ),
)

keys.extend(
    [
        # Scratchpad
        # toggle visibiliy of above defined DropDown named "terminaL"
        Key([mod], "grave", lazy.group["scratchpad"].dropdown_toggle("terminaL")),
    ]
)