AppDesigner Error "Functionality not supported with figures created with the uifigure function" only when opening distributed .exe on other devices.

I am having an issue where my GUI crashes a few seconds afler opening on other devices. This only occurs when the packaged .exe is opened on devices other than my own, both when Runtime is preinstalled or installed upon opening. The error "Functionality not supported with figures created with the uifigure function" is stated to occur when my startupFcn, shown below, attempts to run. What could be causing this issue? The GUI works 100% fine on my device when run either directly from AppDesigner or from the .exe. It also works fine when the code si run from AppDesigner on other machines.

     % Fix window sizing bugs
            warning off MATLAB:ui:uifigure:UnsupportedAppDesignerFunctionality
            set(0,'units','pixels');
            Pix_SS = get(0,'screensize');
            k_vert=Pix_SS(4)/1080;
            k_hor=Pix_SS(3)/1920;
            %k_vert=0.75;
            %k_hor=0.6;
            uisize = app.UIFigure.Position;
            screenWidth = uisize(3);
            screenHeight = uisize(4);
            left = uisize(1);
            bottom = uisize(2);
            width = screenWidth*k_hor;
            height = screenHeight*k_vert;
            k_font=(k_hor+k_vert)/2;
            drawnow;
            comp=app.UIFigure.Children;
            app.UIFigure.Position = [left bottom width height];
            assignin('base', 'pos', app.UIFigure.Position);
            assignin('base', 'compp', app.UIFigure.Children);
            for i=1:numel(comp)
                app.UIFigure.Children(i).Position(3)=comp(i).Position(3)*k_hor;
                app.UIFigure.Children(i).Position(4)=comp(i).Position(4)*k_vert;
                app.UIFigure.Children(i).Position(1)=comp(i).Position(1)*k_hor;
                app.UIFigure.Children(i).Position(2)=comp(i).Position(2)*k_vert;
                    try
                    a{i} = comp(i).FontSize;
                    catch
                    warning('This object does not have font option.  Assigning a value of 0.');
                    a{i} = 0;
                    end
                if a{i}~=0
                app.UIFigure.Children(i).FontSize=comp(i).FontSize*k_font;
                end
            end
            

[Kevin Holly]

Does the other device have a different Operating System or is one 32-bit vs 64-bit?

"Standalone applications run on Windows®, Linux®, and macOS corresponding to the platform on which they are generated."

[Michael Sudol]

I have tried on both and it worked on neither

*Meaning both 32 and 64 bit Windows @Kevin Holly

[Kevin Holly]

Were you able to compile other apps to a standalone executable and succesfully run it on other devices with the same operating system?

[Michael Sudol]

@Kevin Holly Yes, I was able to package and run both premade apps as well as other ones of my own on my own device as well as others. I've tried deleting the entirety of the startupFcn and it does now successfully run on other devices, but the spacing and sizing can get a bit weird on different resolution screens.