Run the following script to determine the number/types of managed servers registered in the run and patch file systems

SELECT  extractValue(XMLType(TEXT),'//host[@oa_var="s_hostname"]'),
extractValue(XMLType(TEXT),'//oacore_server_ports'),
extractValue(XMLType(TEXT),'//forms_server_ports'),
extractValue(XMLType(TEXT),'//oafm_server_ports'),
extractValue(XMLType(TEXT),'//forms-c4ws_server_ports'),
extractValue(XMLType(TEXT),'//oaea_server_ports')
from fnd_oam_context_files
where name not in ('TEMPLATE','METADATA')
and (status is null or status !='H')
and EXTRACTVALUE(XMLType(TEXT),'//file_edition_type')='run'
and CTX_TYPE = 'A';


SELECT  extractValue(XMLType(TEXT),'//host[@oa_var="s_hostname"]'),
extractValue(XMLType(TEXT),'//oacore_server_ports'),
extractValue(XMLType(TEXT),'//forms_server_ports'),
extractValue(XMLType(TEXT),'//oafm_server_ports'),
extractValue(XMLType(TEXT),'//forms-c4ws_server_ports'),
extractValue(XMLType(TEXT),'//oaea_server_ports')
from fnd_oam_context_files
where name not in ('TEMPLATE','METADATA')
and (status is null or status !='H')
and EXTRACTVALUE(XMLType(TEXT),'//file_edition_type')='patch'
and CTX_TYPE = 'A';

Also Compare the run context file and patch context files on the file system
to ensure the following variables contain the same number of managed server entries:
s_adminservername
s_oacore_server_ports
s_forms_server_ports
s_oafm_server_ports
s_forms-c4ws_server_ports
s_oaea_server_ports