I like to keep Spine in Dock.

When I did, I've discovered that something is wrong with Spine launcher (/Applications/Spine/Spine.app)

I can run multiple instances of Spine, yet no one of them can bee kept in Dock. I dragged the "Spine.app" to Dock to keep it there. Now the dragged icon just launches other separate instances, and the original one isn't affected.

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When I close the instances, this thing happens:

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When I run one of the gray icons, a terminal window appears with the following:

Last login: Tue Mar 11 17:38:28 on ttys001
mpro:~ cdes$ /System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java ; exit;
Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)

where options include:
    -d32          use a 32-bit data model if available
    -d64          use a 64-bit data model if available (implies -server, only for x86_64)
    -client	  to select the "client" VM
    -server	  to select the "server" VM
    -jvm	  is a synonym for the "client" VM  [deprecated]
    -hotspot	  is a synonym for the "client" VM  [deprecated]
                  The default VM is client.
                  

-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
              A : separated list of directories, JAR archives,
              and ZIP archives to search for class files.
-D<name>=<value>
              set a system property
-verbose[:class|gc|jni]
              enable verbose output
-version      print product version and exit
-version:<value>
              require the specified version to run
-showversion  print product version and continue
-jre-restrict-search | -jre-no-restrict-search
              include/exclude user private JREs in the version search
-? -help      print this help message
-X            print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
              enable assertions
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
              disable assertions
-esa | -enablesystemassertions
              enable system assertions
-dsa | -disablesystemassertions
              disable system assertions
-agentlib:<libname>[=<options>]
              load native agent library <libname>, e.g. -agentlib:hprof
                see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:<pathname>[=<options>]
              load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
              load Java programming language agent, see java.lang.instrument
-splash:<imagepath>
              show splash screen with specified image
logout

[Process completed]