I am trying to set my custom document size it and replaces it with letter and other numbers. For example if I input 23.75 and tab to the next size it changes it to 23p9
Y(our ruler units are set to Picas and InDesign is doing the conversion. You can either change the units, or include them with the dimension, or, if you really do want to work in Picas, understand that 9 pts (the p9) is .75 pica.
Thanks Peter, I was having a senior moment being on a PC now (not by choice) after 26 years on a Mac. All programs were updated after 5 years and forgot to hit the apply button when I was changing it to inches. Programs all look a little different after 5 yrs with no upgrades..