If the page orientation under ‘Format’ > ‘Page’ is set correctly for each used page style, the issue should surely lie in the range of printer/printer driver. There are many different Epson printers and probably outdated printer drivers. To get help more likely, you should name your OS/version, the printer, and the actually used driver.
On any system the same printer (hardware) can be installed with different drivers (software) under more than one names. One of the installations may be set as Standard … Anotherone may be chosen for printing from LibO…
A lot of fringes…
Edited regarding the course of the discussion here: Irrelevant parts striked out, explanation below added.
As I see it, it turned out that the issue is completely due to the operating system being OSX of some verion((s) on a Mac. In addition it seems most likely that it specifically is related to the outdated USA paper sizes. Unfortunately the OQ didn’t name the OS even after being requested expressly.
In this thread and in others on the issue as well, the preferred suggested workaround was: Omit the usage of the predefined paper size and replace it by a slightly different ‘User’ defined size, say about 2/100 of an inch (2.54 cm) or 0.03 cm larger in one dimension. The change must be sufficient to persist over a save/reload cicle. (During my testing 0.02 cm e.g. were first accepted as a relevant change, but not properly saved then.) Please test to be sure.
Regarding the recent answer by @JohnSidles:
As he stated himself, the steps need to be repeated in advance of each printout.
This may be error-prone and time-consuming.
I would prefer to apply the workaround described above to each template I have in use, in specific to the standard template of any document type if afflicted.
(Sorry, lacking a Mac I cannot test myself. But I watched the related threads, and feel rather sure that my advice is not just a blind man’s talking about colors.)