Model written in Pharo and DSL return different results

Models written in Pharo
``KEDeterministicExamples>>modelRK4SolverOnMigrationOneSpeciesModel``:
https://github.com/KendrickOrg/kendrick/blob/master/src/Kendrick-Examples/KEDeterministicExamples.class.st#L1257

and with DSL returns different result: 
https://github.com/KendrickOrg/kendrick/blob/master/documentation/formal-SoC-models/m2.md
