it appears that jtreg doesn't support having multiple entries for the same test in one problem list (see CODETOOLS-7902481).
the following occurrences in hotspot-related problem lists should be merged in order to achieve the expected behavior.

./open/test/hotspot/jtreg/ProblemList-graal.txt:vmTestbase/nsk/jvmti/ForceEarlyReturn/ForceEarlyReturn001/TestDescription.java 2
./open/test/hotspot/jtreg/ProblemList-graal.txt:vmTestbase/nsk/jvmti/ForceEarlyReturn/ForceEarlyReturn002/TestDescription.java 2
./open/test/hotspot/jtreg/ProblemList-graal.txt:vmTestbase/nsk/jvmti/PopFrame/popframe001/TestDescription.java 2
./open/test/hotspot/jtreg/ProblemList-graal.txt:vmTestbase/nsk/jvmti/PopFrame/popframe003/TestDescription.java 2
./open/test/hotspot/jtreg/ProblemList-graal.txt:vmTestbase/nsk/jvmti/PopFrame/popframe005/TestDescription.java 2
./open/test/hotspot/jtreg/ProblemList-graal.txt:vmTestbase/nsk/jvmti/scenarios/hotswap/HS102/hs102t001/TestDescription.java 2
./open/test/jdk/ProblemList-graal.txt:com/sun/jdi/EarlyReturnTest.java 3
./open/test/jdk/ProblemList-graal.txt:com/sun/jdi/PopAndStepTest.java 3
./open/test/jdk/ProblemList-graal.txt:com/sun/jdi/PopAsynchronousTest.java 3
./open/test/jdk/ProblemList-graal.txt:com/sun/jdi/PopSynchronousTest.java 3
./open/test/jdk/ProblemList-graal.txt:com/sun/jdi/RedefineCrossStart.java 3
./open/test/jdk/ProblemList-graal.txt:com/sun/jdi/RedefineG.java 3
./open/test/jdk/ProblemList-graal.txt:com/sun/jdi/RedefineTTYLineNumber.java 3