Title texts missing on the title bar after customising variable

Hi, I have modified my child theme functions.php file for custome variables, but when a visitor visiting my post page :

Please see the below image
https://d.pr/free/i/tuIoIc
The page Title Should be (the value of) %ListingCat% for sale in %ListingLoc%
But the Listing category and Location is missing on titles – Can I solve it ?

I use custome variables such as %listingCat% & %listingLoc% but for few types of posts it works well, but for others, not.
Following are my type of posts:

a) Listings | Not working
Eg : https://aesell.com/listing/property-management-software/
Title on the backend : IT Software Dealers in Dubai – Business Listing on aesell
On the title bar : Dealers in Dubai – Business Listing on aesell
b) Properties | Not working
Eg: https://aesell.com/properties/contrax-properties/
Title on the backend : Real Estate for sale in Dubai – aesell
On the title bar : for sale in – aesell
c) Classifieds | Thank you. Its working
Eg: https://aesell.com/classifieds/wooden-pergola-contractor-dubai-pergola-shades-uae/
d) Motors | Thank you. Its working
Eg: https://aesell.com/motors/2016-lexus-es-350-gcc-in-perfect-condition/
e) Activities | Not working
Eg: https://aesell.com/activities/dubai-desert-safari-2/
Title on the backend : Desert Safari in Dubai – Activities and deals in UAE
On the title bar : in – Activities and deals in UAE

2) Could you give your email, so I can give a temporary access.

Thank you so much in advance,
Sajesh