There is a problem while retrieving results for testng when the testng XML file contains the constructions <suite-file path="./suite1.xml"/> with multiple suites.
Here are the details.

At first, this is the example that works OK:
<suite name="TAM TestSuite">
<test name="MRCT1100"><classes><class name="com.ingenico.tam.testsuite.merchants.MRCT1101"></class></classes></test>
<test name="SCNWZD1100"><classes><class name="com.ingenico.tam.testsuite.scenariowizard.SCNWZD1100"></class></classes></test>
</suite>
Here there are two tests, the first one is successful, the second one fails. In this format everything is OK, see the screenshot jenkins-ok.png.
I attach also the file testng-results.ok for this case.

Next, I do the same tests java with the same confuguration of testlink and plugin. I replace only the testng XML file by three files (attached): All.xml, TAMMerchants.xml, TAMScenarioWizard.xml.
The tests are the same, but they are organized in separate files:
<suite name="TAM TestSuite" parallel="false" thread-count="1" preserve-order="true">
<suite-files>
<suite-file path="./TAMMerchants.xml"/>
<suite-file path="./TAMScenarioWizard.xml"/>
</suite-files>
</suite>
In this case both tests are executed by testng, but the problem appears when the plugin retrieves the result, see the screenshot jenkins-ko.PNG attached.
The test from TAMScenarioWizard.xml is Not Run.
However it was executed, see the file testng-results.ko attached.

In TestLink also:

• for the first case the test MRCT1100 is successful, and SCNWZD1100 failes
• in the second case the test MRCT1100 is successful, and SCNWZD1100 Not Run

It seems that there is a problem when processing testng-results.xml: in first case it contains only one suite ,and it works, and in the seconde case there are three suite tags, and only one result is retrieved.

I join also the file config.xml