Webdynpro deployment strange behaviour

Hello and thanks in advice

I developed my first dynpro, deployed and tested

All worked fine, the strange behaviour start from this point.

I've modified and re-deployed(from netweaver studio) the dynpro, but i can't see the expected update via browser.

Looking deeper under SDM

C:\usr\sap\J2E\JC00\SDM\root\origin\local\<myapp name>\LOKAL\0.2005.07.26.18.52.50

i found a list of ear file called tempXXXXX<myapp name>

that aren't deployed at all.

Each time i re-deploy myapp a new ear file appear under this path, but no "real deploy" occurs.

Looking under myapp project a .ear file, generated by studio, exist.

if i remove the .ear from the project dir and re-do the deploy all go fine.

Could someone explain me why do i have to remove the ear?

Do i made any mistake?