Within the Panth, there are various versions of Rehras and other compiled Banis depending on the beliefs and research by different jathbandhis and sampardhas. Therefore, you will find different versions across varying Gutkas, websites, apps and so forth. We, as a standard, follow SGPC versions of Rehras Sahib but do offer the ability to change it with another version you would like to use. This is a setting in the app under "settings". You can choose short, medium, long and extra long. There is also an explanation of each and which sampardhas typically use which version.