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That is probably smearing or ringing.
Did it do it before the alignment?
If so have you tested your RF signal source with another CRT TV that is known to work and confirmed there is no smearing in the signal source?
If not can you put the adjustments back?
Have you tried the fine tuning adjustment?
On vintage TVs it is best NOT to align the video IF (and to an extent the tuner) unless they are not allowing a reasonably good picture. It takes a good deal of skill, experience and calibrated signal generation equipment to make an improvement on the original alignment.
Does your set have a DC restoration circuit or DC coupled video circuits between the detector and CRT? Sets that lack DC video coupling and restoration sometimes have a certain degree of smearing on sharp monochrome transitions by design...We get used to modern color TVs that have all have DC restoration and forget what it looks like on monochrome sets where it was not considered a standard design requirement.
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